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De Leo JA, Tawfik VL, LaCroix-Fralish ML.De Leo JA, et al.Pain. 2006 May;122(1-2):17-21. doi: 10.1016/j.pain.2006.02.034. Epub 2006 Mar 29.Pain. 2006.PMID: 16564626Review.No abstract available.